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Update: Foreign Key & Comments 

Summary: Foreign Key functions are now available

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>
This commit is contained in:
Gnanakeethan Balasubramaniam 2017-07-06 20:26:37 +05:30
parent c1ba11f531
commit e888fee4e0
No known key found for this signature in database
GPG Key ID: 24924006ABA72F31
2 changed files with 63 additions and 16 deletions
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78
migration/ddl.go
View File

@ -25,13 +25,6 @@ type Index struct {
Name string
}
// Foreign struct defines a single foreign relationship
type Foreign struct {
Column *Column
ForeignTable string
ForeignColumn string
}
// Unique struct defines a single unique key combination
type Unique struct {
Definition string
@ -50,6 +43,15 @@ type Column struct {
Modify bool
}
// Foreign struct defines a single foreign relationship
type Foreign struct {
ForeignTable string
ForeignColumn string
OnDelete string
OnUpdate string
Column
}
// RenameColumn struct allows renaming of columns
type RenameColumn struct {
OldName string
@ -98,6 +100,27 @@ func (m *Migration) UniCol(uni, name string) *Column {
return col
}
//ForeignCol creates a new foreign column and returns the instance of column
func (m *Migration) ForeignCol(colname, foreigncol, foreigntable string) (foreign *Foreign) {
foreign = &Foreign{ForeignColumn: foreigncol, ForeignTable: foreigntable}
foreign.Name = colname
m.AddForeign(foreign)
return foreign
}
//SetOnDelete sets the on delete of foreign
func (foreign *Foreign) SetOnDelete(del string) *Foreign {
foreign.OnDelete = "ON DELETE" + del
return foreign
}
//SetOnUpdate sets the on update of foreign
func (foreign *Foreign) SetOnUpdate(update string) *Foreign {
foreign.OnUpdate = "ON UPDATE" + update
return foreign
}
//Remove marks the columns to be removed.
//it allows reverse m to create the column.
func (c *Column) Remove() {
@ -125,7 +148,7 @@ func (c *Column) SetNullable(null bool) *Column {
//SetDefault sets the default value, prepend with "DEFAULT "
func (c *Column) SetDefault(def string) *Column {
c.Default = def
c.Default = "DEFAULT " + def
return c
}
@ -265,6 +288,15 @@ func (m *Migration) GetSQL() (sql string) {
}
sql += fmt.Sprintf(")")
}
for index, foreign := range m.Foreigns {
sql += fmt.Sprintf(",\n `%s` %s %s %s %s %s", foreign.Name, foreign.DataType, foreign.Unsign, foreign.Null, foreign.Inc, foreign.Default)
sql += fmt.Sprintf(",\n KEY `%s_%s_foreign`(`%s`),", m.TableName, foreign.Column.Name, foreign.Column.Name)
sql += fmt.Sprintf("\n CONSTRAINT `%s_%s_foreign` FOREIGN KEY (`%s`) REFERENCES `%s` (`%s`) %s %s", m.TableName, foreign.Column.Name, foreign.Column.Name, foreign.ForeignTable, foreign.ForeignColumn, foreign.OnDelete, foreign.OnUpdate)
if len(m.Foreigns) > index+1 {
sql += ","
}
}
sql += fmt.Sprintf(")ENGINE=%s DEFAULT CHARSET=%s;", m.Engine, m.Charset)
break
}
@ -279,17 +311,25 @@ func (m *Migration) GetSQL() (sql string) {
sql += fmt.Sprintf("\n DROP COLUMN `%s`", column.Name)
}
if len(m.Columns) > index+1 {
if len(m.Columns) > index {
sql += ","
}
}
for index, column := range m.Renames {
sql += fmt.Sprintf(",\n CHANGE COLUMN `%s` `%s` %s %s %s %s %s", column.OldName, column.NewName, column.DataType, column.Unsign, column.Null, column.Inc, column.Default)
sql += fmt.Sprintf("CHANGE COLUMN `%s` `%s` %s %s %s %s %s", column.OldName, column.NewName, column.DataType, column.Unsign, column.Null, column.Inc, column.Default)
if len(m.Renames) > index+1 {
sql += ","
}
}
for index, foreign := range m.Foreigns {
sql += fmt.Sprintf("ADD `%s` %s %s %s %s %s", foreign.Name, foreign.DataType, foreign.Unsign, foreign.Null, foreign.Inc, foreign.Default)
sql += fmt.Sprintf(",\n ADD KEY `%s_%s_foreign`(`%s`)", m.TableName, foreign.Column.Name, foreign.Column.Name)
sql += fmt.Sprintf(",\n ADD CONSTRAINT `%s_%s_foreign` FOREIGN KEY (`%s`) REFERENCES `%s` (`%s`) %s %s", m.TableName, foreign.Column.Name, foreign.Column.Name, foreign.ForeignTable, foreign.ForeignColumn, foreign.OnDelete, foreign.OnUpdate)
if len(m.Foreigns) > index+1 {
sql += ","
}
}
sql += ";"
break
@ -304,28 +344,34 @@ func (m *Migration) GetSQL() (sql string) {
} else {
sql += fmt.Sprintf("\n DROP COLUMN `%s`", column.Name)
}
if len(m.Columns) > index+1 {
if len(m.Columns) > index {
sql += ","
}
}
if len(m.Primary) > 0 {
sql += fmt.Sprintf(",\n DROP PRIMARY KEY")
sql += fmt.Sprintf("\n DROP PRIMARY KEY,")
}
for index, unique := range m.Uniques {
sql += fmt.Sprintf(",\n DROP KEY `%s`", unique.Definition)
if len(m.Uniques) > index+1 {
sql += fmt.Sprintf("\n DROP KEY `%s`", unique.Definition)
if len(m.Uniques) > index {
sql += ","
}
}
for index, column := range m.Renames {
sql += fmt.Sprintf(",\n CHANGE COLUMN `%s` `%s` %s %s %s %s", column.NewName, column.OldName, column.OldDataType, column.OldUnsign, column.OldNull, column.OldDefault)
if len(m.Renames) > index+1 {
sql += fmt.Sprintf("\n CHANGE COLUMN `%s` `%s` %s %s %s %s", column.NewName, column.OldName, column.OldDataType, column.OldUnsign, column.OldNull, column.OldDefault)
if len(m.Renames) > index {
sql += ","
}
}
for _, foreign := range m.Foreigns {
sql += fmt.Sprintf("\n DROP KEY `%s_%s_foreign`", m.TableName, foreign.Column.Name)
sql += fmt.Sprintf(",\n DROP FOREIGN KEY `%s_%s_foreign`", m.TableName, foreign.Column.Name)
sql += fmt.Sprintf(",\n DROP COLUMN `%s`", foreign.Name)
}
sql += ";"
}
case "delete":

1
migration/migration.go
View File

@ -89,6 +89,7 @@ func (m *Migration) Down() {
}
//Migrate adds the SQL to the execution list
func (m *Migration) Migrate(migrationType string) {
m.ModifyType = migrationType
m.sqls = append(m.sqls, m.GetSQL())